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3 years ago

2. Explain Why would it be difficult to find the volume of a rock using a ruler?

Chemistry

1 answer:

dedylja [7]3 years ago

8 0

Answer:

Most of these rocks are not made up of common geometric shapes

Explanation:

Because most rocks are not made up of common geometric shapes, it would be difficult or impossible to find the volume of a rock using a ruler; there would be no easy way to measure the rock's volume using a ruler

Hope this helped!

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A balloon contains 11.1 g of nitrogen monoxide gas (NO). how many molecules are in the balloon?

grandymaker [24]

The number of molecules that are in balloon are = 2.227 x10^23 molecules

<h3> calculation</h3>

calculate the number of moles of NO

moles = mass/molar mass

molar mass of NO = 14+ 16 = 30 g/mol

moles is therefore= 11.1 g/30g/mol= 0.37 moles

by use of Avogadro's constant that is

1 mole= 6.02 x10^23 molecules

0.37 =? molecules

=(6.02 x10^23 x 0.37 moles)/ 1mole=2.227 x10^23 molecules

4 0

3 years ago

What is the expected value for the heat of sublimation of acetic acid if its heat of fusion is 10.8 kJ/mol and its heat of vapor

Dennis_Churaev [7]

Answer:

35.1 kJ/mol is the expected value for the heat of sublimation of acetic acid.

Explanation:

$CH_3COOH(l)\rightarrow CH_3COOH(g)$ ..[1]

Heat of vaporization of acetic acid = $H^o_{vap}=24.3 kJ/mol$

$CH_3COOH(s)\rightarrow CH_3COOH(l)$ ..[2]

Heat of fusion of acetic acid = $H^o_{fus}=10.8 kJ/mol$

Heat of sublimation of acetic acid = $H^o_{sub}=?$

$CH_3COOH(s)\rightarrow CH_3COOH(g)$ ..[3]

[1] + [2] = [3] (Hess's law)

$H^o_{sub}=H^o_{vap}+H^o_{fus}$

$=24.3 kJ/mol+10.8 kJ/mol=35.1 kJ/mol$

35.1 kJ/mol is the expected value for the heat of sublimation of acetic acid.

5 0

3 years ago

Given the reaction that occurs in an electrochemical cell: Zn(s) + CuSO4(aq) --> ZnSO4(aq) + Cu(s) During this reaction, the

liq [111]

<span>Zn⁰(s) + CuSO4(aq) --> Zn²⁺SO4²⁻(aq) + Cu(s)

</span>Zn⁰ --- in free elements oxidation number is 0.
Zn²⁺SO4²⁻ ---- ionic compound , it has ion Zn²⁺, so oxidation number here is +2.
<span>The oxidation number of Zn changes from 0 to +2.</span>

8 0

3 years ago

Calculate the mass of copper that could be made from 4.0g of copper oxide

Licemer1 [7]

The mass of copper that will be produced from copper oxide is determined as 3.19 g.

<h3>Mass of copper produced from copper oxide</h3>

The mass of copper that will be produced from copper oxide is calculated as follows;

2Cu + O₂ -----> 2CuO

2 1 2

2(63.5) ------------ 2(79.5)

x ---------------------- 4 g

x = (4 x 2 x 63.5)/(2 x 79.5)

x = 3.19 g

Thus, the mass of copper that will be produced from copper oxide is determined as 3.19 g.

Learn more about copper here: brainly.com/question/24856041

#SPJ1

7 0

2 years ago

A 9.03 g sample of magnesium reacts completely with 3.48 g of nitrogen to form a compound of

hjlf

Answer:

12.5 g

Explanation:

<em>12.5 g of the compound would be formed.</em>

First, let us look at the balanced equation of reaction.

$3 Mg(s) + N_2(g) --> Mg_3N_2(s)$

3 moles of Mg is required to react with 1 mole of N2 to produce 1 mole of product.

<em>Recall that: mole = mass/molar mass</em>

9.03 g of Mg = 9.03/24.3 = 0.3716 mole

3.48 g of N2 = 3.48/28 = 0.1243 mole

Mole ratio of Mg/N2 = 3:1

<em>Hence, there is no limiting reactant.</em>

3 moles of Mg is required for 1 mole of product.

0.3716 mole of Mg will therefore require:

0.3716 x 1/3 = 0.1239 moles of product.

Molar mass of product $Mg_3N_2$ = 100.9 g/mol

Mass of 0.1239 mole $Mg_3N_2$ = mole x molar mass

= 0.1239 x 100.9 = 12.5 g

8 0

3 years ago